<template>
  <div class="singleImageUpload2 upload-container">
    <el-upload
      :data="dataObj"
      :multiple="false"
      :show-file-list="false"
      :on-success="handleImageSuccess"
      class="image-uploader"
      drag
      action="https://httpbin.org/post">
      <i class="el-icon-upload"/>
      <div class="el-upload__text">Drag或<em>点击上传</em></div>
    </el-upload>
    <div v-show="imageUrl.length>0" class="image-preview">
      <div v-show="imageUrl.length>1" class="image-preview-wrapper">
        <img :src="imageUrl">
        <div class="image-preview-action">
          <i class="el-icon-delete" @click="rmImage"/>
        </div>
      </div>
    </div>
  </div>
</template>

<script lang="ts">
import { Component, Vue, Prop } from 'vue-property-decorator';
import { getToken } from '@/api/qiniu';
import { AxiosResponse } from 'axios';

@Component
export default class SingleImageUpload2 extends Vue {
  @Prop({ default: '' })
  value!: string;

  private tempUrl: string = '';
  private dataObj: { token: string, key: string } = { token: '', key: '' };

  get imageUrl(): string {
    return this.value;
  }

  rmImage() {
    this.emitInput('');
  },
  emitInput(val: string) {
    this.$emit('input', val);
  },
  handleImageSuccess() {
    this.emitInput(this.tempUrl);
  },
  beforeUpload() {
    const _self = this;
    return new Promise((resolve, reject) => {
      getToken().then((response: AxiosResponse) => {
        const key = response.data.qiniu_key;
        const token = response.data.qiniu_token;
        _self.dataObj.token = token;
        _self.dataObj.key = key;
        this.tempUrl = response.data.qiniu_url;
        resolve(true);
      }).catch((err: Error) => {
        reject(false);
      })
    })
  }
}
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
.upload-container {
  width: 100%;
  height: 100%;
  position: relative;
  .image-uploader {
    height: 100%;
  }
  .image-preview {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0px;
    top: 0px;
    border: 1px dashed #d9d9d9;
    .image-preview-wrapper {
      position: relative;
      width: 100%;
      height: 100%;
      img {
        width: 100%;
        height: 100%;
      }
    }
    .image-preview-action {
      position: absolute;
      width: 100%;
      height: 100%;
      left: 0;
      top: 0;
      cursor: default;
      text-align: center;
      color: #fff;
      opacity: 0;
      font-size: 20px;
      background-color: rgba(0, 0, 0, .5);
      transition: opacity .3s;
      cursor: pointer;
      text-align: center;
      line-height: 200px;
      .el-icon-delete {
        font-size: 36px;
      }
    }
    &:hover {
      .image-preview-action {
        opacity: 1;
      }
    }
  }
}
</style>
